Joao Mario, a key player in the team which won the European Championship two years ago, replaced Manuel Fernandes while Goncalo Guedes kept his place in attack, again being preferred to Andre Silva.

Ronaldo made European football history when he stooped to score with a powerful header from Joao Moutinho's right-flank cross after a corner.

His 85th goal for Portugal broke a tie with Hungary great Ferenc Puskas as the most ever for a European national team. Only Ali Daei of Iran, who scored 109 international goals, is ahead of Ronaldo in the world list.

Ronaldo created a good scoring chance for Goncalo Guedes in the 39th but Morocco goalkeeper Monir El Kajoui stood tall and strong to beat out the shot.

Earlier, Cristiano Ronaldo drilled in a fourth minute header to give Portugal a 1-0 lead over Morocco at halftime in their World Cup Group B match on Wednesday and take his goal tally at the tournament to four.

Morocco, who will become the first team who are unable to progress to the next stage if they lose, found space to attack but had trouble getting into the Portuguese box.

Cristiano Ronaldo has scored his fourth goal at the World Cup and Portugal leads Morocco 1-0 in the fourth minute at Luzhniki Stadium.

Ronaldo stooped to score with a powerful header after he evaded his marker, Manuel Da Costa, when the ball was crossed from the right flank after a corner.

Ronaldo, who scored a hat-trick in Portugal's opening 3-3 draw with Spain, is now the all-time leading scorer for any European national team. His 85th career goal for Portugal moves him ahead of Hungary great Ferenc Puskas.

Midfielder Joao Mario was included in Portugal's starting line-up for the World Cup Group B match against Morocco on Tuesday in the only change from the team which started the 3-3 draw against Spain.

Joao Mario, a key player in the team which won the European Championship two years ago, replaced Manuel Fernandes while Goncalo Guedes kept his place in attack, again being preferred to Andre Silva.

Morocco made three changes to the team which lost 1-0 to Iran as defenders Manuel da Costa and Nabil Dirar and forward Khalid Boutaib were all included.

Da Costa, born in France to Portuguese and Moroccan parents, played for Portugal at under-21 and under-23 level before choosing to represent the North Africans at senior level.

Noureddine Amrabat retains his place in the Morocco team to play Portugal, days after sustaining a head injury in a 1-0 loss against Iran.

Amrabat was treated in a hospital and regarded as a doubtful starter for a game Morocco likely needs to win to have hopes of advancing.